我就废话不多说了，直接上代码吧！ import numpy as np import torch import torch.nn as nn import torch.nn.functional as F # 支持多分类和二分类 class FocalLoss(nn.Module): """ This is a implementation of Focal Loss with smooth label cross entropy supported which is proposed

我就废话不多说了，直接上代码吧！ import torch import torch.nn.functional as F import numpy as np from torch.autograd import Variable ''' pytorch实现focal loss的两种方式(现在讨论的是基于分割任务) 在计算损失函数的过程中考虑到类别不平衡的问题，假设加上背景类别共有6个类别 ''' def compute_class_weights(histogram): classWe